Triple valve cylinder cap



May 19, 1931.

TRIPLE VALVE CYLINDER CAP Filed Aug. 21, 1928 Lnnnnnnnnnnmgngggg i. Y i "1'1",

W' S1, A

INVENTOR CLYDE C; FAR-MER ATTORNEY c. FARMER 1,805,658

Patented May 19,1931 f UNITED vstr -ALas OFFICE i i i cLYDE c. FARMER, oF,1?ITTsBURG1i, PENNSYLVANIA, Ass'IGNoR '.ro THEWESTING; HOUSE Ain BaAKEjcoi/BANY,'OEWILMEBMNQ ,PENNSYLVANIA A coRroRA'rIoN f f or PENNSYLVANIA TRIPLEvALvBcYLINDER. cer@ n Application ledAugust 21, '1928.y Serial N 0.300,984.

This invention relates to fluid pressureop-y eratedvalve devices, andmore particularly totriple valve devices such as are employedin fluid pressure brake 'systems for controlling 5the brakes. W. .l y j y Anjobject of the linvention-is toprovide a triple valve device With `means for removing foreign matter from 'thefflu'id supplied tothe .brakesystem Y. v i .fi Another object of the inventionis to provideank -air filter or strainer Which.gmay be .readily vattached to the standard triple valve devicesnow in service. A i

Another object of the invention is' to prog, vide ymeans for-cleaning. the fluid suppliedV to triple valve devices which permits the yoperation of vthe lvalves under all*Y conditions ofservice. V f 1 Another object of -thelinvention isto pro- `V20l vide a Vtriple valve device of thecharacter mentioned Vwhich is relatively simple in vconstructiomandreliable and exactvin function,

under all conditions ofservice.-

The. invention.V also comprises` certain new y f 25- and useful improvements in the construction, arrangement and,COIIlbination of the several` partsfofwhich itis composed, as will 4be here-y inafter more fully .described andclaimed, f In the accompanying drawings; Fig. 1 is feo a diagrammatic sectional view of a triple valve device vprovided 4with', my improvement;A and Figs. 2 andyare sections takenv on the lines 2--2y andk3+3 respectively ,of Figl.' Y'

In a fluid pressure brake system, atriple valve device -is employed Which is subject to brake pipe ypressurea'nd which is operated by variations :in brake pipe pressurefor controlling the application and #release of the Veolbrakes. y. f f

If fluid under pressure-supplied toavalve device of the abovecharacter should contain foreign matter, such foreign matter Will pass Vwith the fluid Vto the Working: partspfthe valve device, Wherezit may accumulate, and then cause Vsluggish Operation of the valve device, or it may ,even result in Ifailure of the valve device to operate. Furthermore', foreign matter ,Whichlpasses through the valve device may be carried into; the other parts of. the

. prevent the entrance Vof foreign matter there# chamberl connected to the auxiliary res.- Lervoir (not shownlby ,a pipe 16 and containtingla main slide valve 17 and a graduating `covered by acap section thatis constructed jthe cap section 22 at 30 and its opposite end internally flanged at, .o 3l and `.xtercnal-y brake system, and thereby cause injury or .undue Wear thereof. Y The fluid often containsr particlesso fine lthat they Will remain in suspension in the airfor a considerableperiod of time, and it fh has been difficult to eliminate the-se fine particles and otherwisepurify the lluid Without affecting the operation of the valve devices. f By the 'present invention, I have provided astrainer or filterfor thebrake pipe fluid. The filter is incorporated in the triple valve device structure in such a manner as t0, permit the operation of, thesaid device under all conditions Iof service and at the same time into. If so desired, the improvementmay .be attached to thestandard triple valve de- Hvices now 1n service by simply replacingthe lgraduating spring cap with a capcontaining the improvemen n Referring to the drawings, the triple valve device'comprisesa casing 411 having a piston V,chamber 12 connected 'tothe brake pipe 1,3

and containing pistonv 14 kand havinga valve slide valve'18 adapted'tobe operated by pis'- -ton 14.5 The chamber 15 has a port 19 which communicates' Withthe brake cylinder (notL x shown) 'through a pipe20. The seat of the valve 17 is vented to the atmosphere through `port 21.`

f The open end of the piston chamber 12 bis 85 so that it maybe applied to theexisting triple valve casings now in use in place ofthe usual capycontaining the graduating spring. Preferably theacap' section is made in tWo' parts 22 'and 23, both ofwhich parts are i90 chambered, as at 24oand 25an'd communicate with each other through conduits-26 and 27. l Fluid under pressure is supplied to the pistonchamber 12 from the brake pipe 13 by a conduit28 lformed in the casing 11 and comi? municating With the chamber 24 in the cap.

"section 22. Y

. A cylinder 29 havingone end threaded into y flan ed at 32, carries a cap 33 which is normal y held against the flange 31 by a graduating spring 34.

The flange 32 of the cylinder 29 has a plurality of holes 35 formed therein to permit the uid under pressure to pass from the chamber 24 into the piston chamber 12, or vice versa, the fluid in the piston chamber 12 to pass into the chamber 24 when the piston 14 moves outwardly.

The end wall of the cap 33 1s perforated at 36 and the inner or threaded end 30 of the cylinder 29 communicates with the conduit 27 through a passage 37 which provides a vent for kthe cylinder when the cap 33 is engaged by the piston 14 during an emergency and forced inwardly against the pressure eX- erted by spring 34.

A plate 38 is fitted to the inner open end of the cap section 22, the periphery of the plate engaging the seat provided by a. rib 39 formed in the cap section.

The plate 38 has a central opening 40 through which the flanged end of the cylinder 29 projects, the flange 32 of the cylinder bearing against the portion of the plate surrounding the opening for the purpose of pressing the plate against its seat.

If so desired a spring washer 41 may be interposed between the flange 32 and the plate 38, the periphery of the washer being o'set from the main body portion thereof so as to engage a gasket 42 which covers the surface of ythe plate exposed to the piston chamber 12.

Encircling the cylinder 29 and bearing against the plate 38 and the end wall of the ca sectionk22 is a filter or strainer F comprising a double walled body formed of ar ir of spaced perforated cylindrical shells V43 and 44 and containing filtering or straining material 45 which fills the annular space between the two shells.

The filter Fis so positioned as to intercept the fluid flowing through the triple valve device and arrest the passage of foreign vmatter.

Any suitable material can he used, but I prefer to employ curled'hair which is impregnated with oil to make the hair sticky so that fine dust and other foreign matter in the fluid will adhere to the hair.

Heretofore it has been found undesirable to oil the parts of the triple valve devices, since the oil tends to collect the fine particles of matter and thus form a gummy coating thereon which tends to retard the action `thereof. If the fine particles are removed from the fluid, then the triple valve devices may be oiled, and thus greatly prolong the kwear thereof.

Referring to Fig. 3, the device is provided former being mounted in a chamber 48 formed in the cap section l22, while the latj ter is mounted in a chamber 49 formed in the cap section 23.

The valve 46 is held normally seated against a seat rib 50 in the chamber 48 by an expansible coil spring 51. The valve thus closes a port 52 connecting the chambers 24 and 48 and thereby prevents the passage of fluid around the filter F and into the piston chamber 12.

The chamber 48 is connected to conduit 26 by a port 53 on the spring side of the valve 46, and as conduit 26 communicates with the interior of the filter F, when the valve 46 is unseated the fluid can by-pass around the filter in a manner to be described.

The valve 47 is held normally seated against a seat rib 54 in the chamber 49 by an expansible coil spring 55. The spring 55 is disposed in a recess 56 formed in the cap section 22, which recess communicates with the' chamber 24 through a port 57. The conduit 425 leads directly to chamber 49.

In the normal operation of the device fluid from the brake pipe 13 flows into chamber 24 and passes through the filter F into the space surrounding the cylinder 29, and thence through the openings 35 to the piston chamber. In this way the filter F operatesto free the fluid fromy foreign matter, so that only purified fluid flows into the piston chamber Under these conditions the check valves 46 and 47 will both remain seated, the former because the spring 51 will press the valve 46 against its seat, and the latter because the' direction of flow of the fluid from the brake mains uniform in the several chambers of; ythe cap sections by reason of the interconnections provided by the conduits 25, 26 and ports 52, 53 and 57. Y

If the curled hair 45 of the filter F should become so clogged with foreign matter as to offer substantial resistance to the flow of fluid, then the pressure of fluid in chamber 24 and acting by flow through port 52 on the seated face of the check valve 46 will exceed the combined pressures of fluid supplied through the filter F to passage 53 and that of spring 51, so that the check valve 46 will be lifted from its seat and will then permit flow of yfluid from the brake pipe 13 by way of port 52, past check valve 46 to passage 5 3, and conduit 26 to piston chamber 12.

When the brake pipe pressure is reduced to effect an application of the brakes, fluid under pressure from piston chamber 12 normally flows back to the brake pipe 13 by way of openings 35', through the filter F, and thence into chamber 24 and'through conduit 28 to thebrake pipe. u

If, however, the filter becomes clogged, so

as vo materially' interfere with the dowI of' pipe.

It will'thus be seen 'thatnormally the fluid under pressure as supplied to or vented from 'f posed of? inner Aand outer sections, each of the triple valve device is freed from foreign matter by flow through the filter F, but in either case, should the filter become clogged,

the flow of fluid will not be interfered with to an extent which would prevent the desired operation of the valve device.

The functional and structural objects above stated are thus seen to be obtained in the construction described. vIt is to be understood that certain features of the invention are ca-y pable of modification and combination yin fluid pressure actuated devices of other types without sacrifice of the attendant advantages.

Having now described my invention, what I claim as new and desire to secure by Lettersy Patent, is Y l 1. A valve device havinga piston chamber said cap'having a chamber provided with a vented wall adjacent the piston chamber, means for supplying Huid to the chamber in the cap, a llter vmounted in the cap andV surrounding the vents in the wall, and a check valve controlling a by-pass around the filter andy operated upon clogging of the filter to permit ow of fluid from the cap chamber through the by-pass passage.

vented wall Vadjacent the piston chamber, means for supplying fluid to the chamber in the cap, a. filter mounted in the cap and surrounding the vents inthe wall, and a pair of check valves, yeach controlling a by-pass around VVthe filter and operated upon cloggingkof the'filter to permit flow'of fluid in either direction from the supply means through the by-pass passages.

3. A valve device comprising a piston chamber open at one end, a cap enclosingv the chamber, said cap being composed of inner and outer sections, eachhaving chambers, the chamber ofthe -inner sectioncommunieating with the piston chamber and also with n comprising acap composed of' twol sections,

fluid supply means, the chamber of the outer through, and means in the by-pass passages for normally closing the same, said means being adapted to open the Lby-pass passages toY permit ,flow of fluid therethrough in either direction when the'filter becomes clogged and hinders the natural vflow of iuid through the :inner section chamber.l f f f 4. -A triple valve device havinga''capcom-l 7 posedf ofinnervandrouter sections, each yof lwhich have chambers, the chamber of the innerfsection communicating with the pistonV chamber of Vthe `valve land also with the fluid supply means, anda filter mounted in .the7

chamber lofA th'eviniie'rr cap section.

r5. .Atifiple valvedevice having a capcomwhichhave chambers, the chamber of the in-' ner, section communicating with the piston .8

chamber ofthe valve and also with the fluid "supply means, and a filter mounted in the chamber of the'innercapfsection in juxta position to the pistonchamber.v

6; 4A triple 'valvedevice havinga cap com- 8 lposed of inner 'and outer sections, each of which have chambers, the chamber ofthe mounted in the inner capsection in juxtapositionto they pistonr` chamber, and a filter surrounding the graduating spring/and .adapted tofintercept the V'fluid flowingv from open at one end, acap enclosing the chamber,

the chamber ofthe inner capV section into the 9 piston chamber; 'l 7. A ,triple `'valve device having a capV composed of inner and outer sections', a chamber inthe inner section communicating with the ktionand surrounding the lvents in the-wall.

2. A valve device having a piston chamber open at one end, a cap enclosing the chamber, said cap havinga chamber provided with a ner sectioncommunicating with the piston r8.3Altriplefvalve device having a cap com-v 1 posed-of innerfand outer sections, each of which have chambers, the chamber vof the inchambergoffthevalve andalso with `thefluid thel'outer'cap section`,fsaid valve being adapted to open the passage when the filter'becoines clogged., vand permit vthe 4fluid to by-passv .through .fthechamber of the outer cap sec- 1 tion. i

9p." Anattachmentjfor triple valveA devices oneof Jwhich has a chamber containing a cyllinder having Ia graduating spring, a remov- 1 able plate constituting one wall or the chain- .ber,.a perforated flange on the cylinderbeari 86 are open.

ad in the chamber, said filter surrounding the vents and enclosing the cylinder.

10. An attachment for triple valve devices comprising a cap composed of two sections,

' one of which has a chamber containing a cyln inder having a graduating spring, a removable plate constitutingone wall of the chamber, a perforated fiange on the cylinder bearing against the plate, the perforations in the V170 Bange providing means for normally venting the chamber, an annular filter mounted in the chamber, said filter surrounding the vents and enclosing the cylinder, and means in the other cap section for by-passing the i5 filter when the same becomes clogged.

11. A triple valve having a cap composed of two sections, one of which has a chamber containing a cylinder enclosing a graduating spring, a removable plate constituting a wall "20 between the capV and the piston chamber of the valve, a perforated flange on the cylinder projecting through the plate, the perforations in the fiange providing means through which the fiuid fiows between the cap and the i5 valve, a filter mounted in the chamber and surrounding the perforations, the inner portion of the filter being hollow, by-passes conneeting the portion of the chamber of the cap section exteriorly of the filter with 4the second cap section, valve devices for normally closing the by-passes, and means connecting the second cap section to the first cap section for directing the fiuid to the hollovs7 portion of the filter when eitherfof the by-passes 12. A triple valve device having a cap composed of inner and outer sections, each of which have chambers, the chamber of the inner section communicating with fiuid sup- U) ply means, a filter mounted in the chamber of the inner cap sect-ion, and means for permitting the Huid to by-pass the filter should thefilter become clogged. f y13. A triple valve device having a cap composed ofY inner and outer sections, each of which have chambers, the chamber-of the inner section communicating with fluid supply means, a filter mounted in the chamber l of the inner cap section, and means for per- 50 mitting thefiuid to bypass the filter should the filter become clogged, said means being interposed between the chambers of the inner and outer cap sections.

' 14. A tri yle valve device having a cap 55 composed o inner and outer sections, a filter v in the inner section, means for directing the fiow of fluid through the filter in the inner section and by-passing the outer section, and

means for directingy the fiow of fiuid through G0 the outer section and by-passing said filter when the filter is'clogged.'

In testimony whereof I have hereunto set ,Y my hand, this' 8th day of August, 1928.

f CLYDE C. FARMER. 

